Standing alone, prosign C means “Correct.” Because it is followed by other information in our example, it means "This is a correct version of the portion of the message indicated.” Another prosign, WA, meaning “word after,” follows certain prosigns (including C) to identify a portion of the text of a plain language message. In figure 3-2, the portion of the text identified is the word after DEBARK, which appears in the text as GROUPS. Accordingly, the final instructions of the message mean “Correct word after DEBARK to TROOPS.” Other prosigns may appear in the final instructions. Prosign C may be followed by AB, AA, or WB, instructing the receiving station to correct portions of the text. Prosign B used alone in the final instructions means “More to follow to all stations called." When B is followed by call signs, it means “More to follow to stations indicated.” Prosign G, for repeat back, may be used in the final instructions if, during transmission, its use is deemed necessary. Used alone, G directs all stations to repeat back the message. When G is preceded by a call sign (or signs), its meaning is “Stations whose call sign (or signs) precede G are to repeat back.” In addition to its use in the transmission instructions and final instructions, G may be used in the text of a flashing light message to indicate the addee is to repeat back the previous group sent by the transmitter. Visual transmissions are completed by ending prosigns K or AR. The K means "This is the end of my transmission to you, and a response is necessary.” Ending prosign AR means "This is the end of my transmission to you, and no response is required or expected." SERVICE MESSAGE A service message is one between communica- tions personnel and pertaining to any phase of traffic handling, communication facilities, or circuit conditions. It is prepared and transmitted in plaindress, abbreviated plaindress, or codress form. The abbreviation SVC following any security classification or UNCLAS in the beginning of the text, identifies a plain-language service message. An encrypted service message will always carry a numerical group and will only be identified as a service message within the encrypted text. Service messages generally concern messages originated at, destined for, or refiled by that station and normally will be assigned a precedence equal to that of the message to which they refer. Examples of plain-language service messages: 1. Plaindress format: P 031500Z MAR 95 GR10 BT UNCLAS SVC BRIDGE TO BRIDGE INOP COME UP ON TGO BT K 2. Abbreviated plaindress format: BT UNCLAS SVC BRIDGE TO BRIDGE INOP COME UP ON TGO BT 1500Z ABBREVIATED SERVICE MESSAGE The text of an abbreviated service message contains only prosigns, operating signals, address designations, identification of messages, parts of messages, and amplifying data as necessary. It may be originated by operators and may contain any of the components shown in the basic format except that 1. The long break is used only if the date-time group/time group is used; and 2. The date time group/time group is to be employed only when it is necessary to indicate the time at which the message was originated or when it is considered that further reference may be made to the message. Examples of abbreviated service messages: 1. INT ZDK NKZO 062222Z MAR 95 K 2. Abbreviated plaindress format: BT INT ZDK NKZO 062222Z MAR 95 BT 2300Z K 3. Plaindress format: P 062323Z MAR 95 GR 6 BT INT ZDK NKZO 062222Z MAR 95 BT K ABBREVIATED PLAINDRESS MESSAGES Operational requirements for speed of handling—contact reports, for example—may dictate the abbreviation of plaindress message headings. At such times, any or all of the following may be omitted from the heading: precedence, date, DTG, and group count. If the DTG is omitted, a time group must be in the ending procedure components. CODRESS MESSAGES A codress message is one in which the entire address, originator and all addressees except when the address indicating groups are used, is encrypted within the text. The heading of such a message contains only information necessary to enable 3-10